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A.A. Kukharskii 《Solid State Communications》1973,13(11):1761-1765
The peculiarities of the damped longitudinal plasma and lattice vibrations coupling in GaAs are analysed with the help of a factorized dielectric function, based on the model of arbitrary bonded oscillators. The plasmon-phonon eigenfrequencies correlation of the effective and initial excitations is derived theoretically and approved experimentally. 相似文献
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This work investigates the influence of non‐locality in the dielectric response on the spatio‐temporal evolution of surface plasmon‐polaritons (SPP). SPP excitations are coherently generated by a quantum scatterer in the vicinity of a flat metal interface. It is demonstrated that the excited non‐equilibrium SPP population eventually splits into two coherent localized wave packets. One packet propagates along the interface and the other is centered in the vicinity of the scatter. The amplitude of both waves slowly decreases due to several relaxation mechanisms, with the Landau damping being the strongest. The non‐locality of the metallic dielectric response considerably influences spatial profiles of the plasmon field intensity, in particular, leading to coherent spatio‐temporal oscillations between the two wave packets. 相似文献
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采用边界元方法研究了快电子在金属纳米双线中激发间隙表面等离激元(SPP)的性质,比较了在不同横截面形状(包括圆形、尖劈形和不规则形状)下电子所激发SPP的不同.研究表明:在以上波导结构中,快电子都能激发具有较长传播距离和较好局域性的低阶单级-单级耦合的间隙等离激元模式;同时通过对波导无量纲价值参数的比较,发现快电子在纳米双线中激发间隙等离激元对双线波导的横截面形状要求不高,横截面形状真正影响的是高阶等离激元模式的激发,而且快电子在截面形状为尖劈的双线波导中能激发局域性更强的间隙SPP.该研究将对实验中利用
关键词:
表面等离激元
间隙模式
金属纳米波导 相似文献
5.
We theoretically and numerically investigate the diffraction properties of surface plasmon polariton(SPP) in binary graphene sheet arrays. The single SPP band splits into two minibands by alternatively arranging the graphene waveguides with two different chemical potentials. Numerical simulations show that SPP beams in the array split into two different paths due to the different diffraction relation. 相似文献
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A numerical simulation of surface wave excitation in a rectangular planar-type plasma source 下载免费PDF全文
The principle of surface wave plasma discharge in a rectangular
cavity is introduced simply based on surface plasmon polariton
theory. The distribution of surface-wave electric field at the
interface of the plasma-dielectric slab is investigated by using the
three-dimensional finite-difference time-domain method (3D-FDTD)
with different slot-antenna structures. And the experimental image
of discharge with a novel slot antenna array and the simulation of
the electric field with this slot antenna array are both displayed.
Combined with the distribution of surface wave excitation and
experimental results, the numerical simulation performed by using
3D-FDTD is shown to be a useful tool in the computer-aided antenna
design for large area planar-type surface-wave plasma sources. 相似文献
8.
Based on a semiclassical Boltzmann transport equation in random phase approximation, we develop a theoretical model to understand low-field carrier transport in biased bilayer graphene, which takes into account the charged impurity scattering, acoustic phonon scattering, and surface polar phonon scattering as three main scattering mechanisms. The surface polar optical phonon scattering of carriers in supported bilayer graphene is thoroughly studied using the Rode iteration method. By considering the metal–BLG contact resistance as the only one free fitting parameter, we find that the carrier density dependence of the calculated total conductivity agrees well with that observed in experiment under different temperatures. The conductivity results also suggest that in high carrier density range, the metal–BLG contact resistance can be a significant factor in determining the BLG conductivity at low temperature, and both acoustic phonon scattering and surface polar phonon scattering play important roles at higher temperature, especially for BLG samples with a low doping concentration, which can compete with charged impurity scattering. 相似文献
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Hui Wang Jinghan You Lin Wang Min Feng Yufang Wang 《Journal of Raman spectroscopy : JRS》2010,41(2):125-129
A double‐resonance process gives rise to the 2D band in the Raman spectra of monolayer and bilayer graphene. Based on the electronic and vibrational dispersion energies of graphene, the wavenumbers of the 2D band were calculated under different laser excitation energies (from 1.0 to 4.4 eV). Calculated results are in good agreement with experimental data and reproduce the experimental dispersion slope of the 2D band very well. The calculated wavenumbers of the 2D band do not show a linear dependence on the laser excitation energies. Moreover, it is explained that the lowest wavenumber peak of the 2D band of the bilayer graphene, which is composed of four components, has the largest slope with laser excitation energy. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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V. I. Silin S. A. Voronov V. A. Yakovlev G. N. Zhizhin 《International Journal of Infrared and Millimeter Waves》1989,10(1):101-120
New experimental evidence is presented which shows that the reliability and the precision of the determination of the optical constants of the metallic and dielectric surfaces can be improved by using the surface electromagnetic wave absorption spectroscopy and SEW phase spectroscopy simultaneously. 相似文献
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According to the electromagnetic field distributions, there exist two kinds of coupled spoof surface plasmon polaritons(SSPPs), the symmetric and anti-symmetric modes, in the three-dimensional(3D) subwavelength spoof–insulator–spoof(SIS) waveguide. We study the dispersion and excitation of the two kinds of coupled SSPPs supported by the 3D SIS waveguide. The evolution of the dispersion with the thickness and gap width of the waveguide is numerically investigated,and we give a theoretical analysis according to the coupling mechanism. Specially, based on the coupling mechanism,we design a zipper structure, through which the excitation and propagation of the anti-symmetric coupled modes can be realized effectively. 相似文献
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Xiaomin Hua 《中国物理 B》2021,30(8):84202-084202
Narrow band mid-infrared (MIR) absorption is highly desired in thermal emitter and sensing applications. We theoretically demonstrate that the perfect absorption at infrared frequencies can be achieved and controlled around the surface phonon resonance frequency of silicon carbide (SiC). The photonic heterostructure is composed of a distributed Bragg reflector (DBR)/germanium (Ge) cavity/SiC on top of a Ge substrate. Full-wave simulation results illustrate that the Tamm phonon-polaritons electric field can locally concentrate between the Ge cavity and the SiC film, contributed to the improved light-phonon interactions with an enhancement of light absorption. The structure has planar geometry and does not require nano-patterning to achieve perfect absorption of both polarizations of the incident light in a wide range of incident angles. Their absorption lines are tunable via engineering of the photon band-structure of the dielectric photonic nanostructures to achieve reversal of the geometrical phase across the interface with the plasmonic absorber. 相似文献
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Photoluminescence enhancement by localized surface plasmons in AlGaN/GaN/AlGaN double heterostructures 下载免费PDF全文
Alexander Y. Polyakov Jin‐Hyeon Yun Haeng‐Keun Ahn Alexander S. Usikov Eugene B. Yakimov Sergey A. Tarelkin Nikolai B. Smirnov Kirill D. Shcherbachev Heikki Helava Yuri N. Makarov Sergey Yu Kurin Sergey I. Didenko Boris P. Papchenko In‐Hwan Lee 《固体物理学:研究快报》2015,9(10):575-579
Double heterostructures AlGaN/GaN/AlGaN grown by hydride vapor phase epitaxy and designed for use as light emitting diodes for 360 nm wavelength were patterned by shallow nanoholes and injected with Ag/SiO2 or Al nanoparticles. A 1.8 times increase in the photoluminescence and microcathodoluminescence signal from the GaN active region was observed for 100 nm diameter Al nanoparticles, the efficiency decreased compared to the reference planar samples for small Al nanoparticles of 30–40 nm diameter, and a moderate increase of 1.2 times was detected for Ag/SiO2 nanoparticles. The observed phenomena are explained by the GaN emitter coupling with localized surface plasmons produced by metallic nanoparticles. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) 相似文献
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Performance of superconducting nanowire single-photon detector with the fan coupling antenna array 下载免费PDF全文
The performance of superconducting nanowire single-photon detector (SNSPD) involving niobium nitride with the fan coupling antenna array is analyzed. The SNSPD has a high detection efficiency and counting rate. Hydrogen silsesquioxane and niobium nitride are filled in the gold grating deposited on the substrate in which the fan coupling antenna arrays are embedded. By changing the position of the fan coupling antenna array, the maximum area of optical intensity is obtained and the photon collection efficiency is increased by 26.5 times. The detection efficiency of SNSPD is improved without changing the detection speed. These parameters are important for designing a practical single-photon detector, 相似文献
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《Laser \u0026amp; Photonics Reviews》2017,11(1)
Plasmon‐induced hot‐electron generation provides an efficient way to convert light into electric current. The investigation of the optoelectronic response in two‐dimensional materials and metallic hybrid nanostructure attracts increasing research interest. Here, we present a tunneling effect of plasmonic hot electrons that is generated from Au nanoparticles, which can vertically tunnel through graphene monolayers. A strong photocurrent induced by the hot electrons was measured in this graphene‐based vertical photodetector with its intensity maximum reached at the plasmon resonance wavelength. The tunneling effect of plasmonic hot electrons was investigated by gradually increasing the incident laser power and bias voltage between the top and bottom electrodes. The dynamic attenuation of plasmonic hot electrons in an excited state was further investigated with multilayered graphene sheets. These results show that our vertical hybrid structure can function as an effective design for the tunneling photodetector, and enable the realization of complex nanophotonic devices that are based on graphene and other 2D materials, such as optical transistors and plasmonic hot‐electron sensors.
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通过观察金属底板中周期地嵌入电介质球壳的体系的光学吸收性质,研究了表面等离子激元 以及与其他电磁模式的耦合特性.在这种周期结构的金属表面,发现存在两种响应频率,分 别对应于表面等离子激元模式和金属中的电介质腔体模式.在这些响应频率上,可观察到与 它们相对应的吸收峰.由于金属的表面模式不能与平面入射光直接耦合,而腔体模式与平面 入射光和表面等离子激元模式的耦合一般较弱,因而通常情况下这些吸收峰的峰值有限.然 而,通过调整体系中的某些参数,可以使腔体模式和表面模式的频率非常接近,这时二者之 间的耦合强度将大大提高.此时,在相应的频率附近可观察到极强的吸收峰.详细地研究了介 质球壳的物理和几何参数对此共振吸收的影响.
关键词:
腔体模式
表面等离子体模式
共振吸收 相似文献
18.
Role of localised surface plasmon polaritons coupling in optical transmission through double-layer metal apertures 下载免费PDF全文
In this paper, we investigate the optical properties of
the double-layer metal films perforated with single apertures by
analysing the coupling of localized surface plasmon polaritons (LSPPs).
It is found that the amplitude and the wavelength of transmission
peak in such a structure can be adjusted by changing the
longitudinal interval D between two films and the lateral
displacements d_{x} and d_{y} which are parallel and
perpendicular to the polarization direction of incident light,
respectively. The variation of longitudinal interval D results in
the redshift of transmission peak due to the change of coupling
strength of LSPPs near the single apertures. The amplitude of
transmission peak decreases with the increase of d_{y} and is less
than that in the case of d_{x}, which originates from the
difference in coupling manner between LSPPs and the localized
natures of LSPPs. 相似文献
19.
Chao‐Hui Yeh Yung‐Chang Lin Pramoda K. Nayak Chun‐Chieh Lu Zheng Liu Kazu Suenaga Po‐Wen Chiu 《Journal of Raman spectroscopy : JRS》2014,45(10):912-917
Twisted bilayer graphene, in which interlayer interaction plays a critical role in this coupled system, is characterized for its angle‐dependent electronic and optical properties. Here, we present a systematic Raman study of single‐crystal twisted bilayer graphene grains, with the spectra of each bilayer graphene precisely correlated to its twist angle using combined transmission electron microscopic technique. Van Hove singularities develop as a result of band rehybridization at the crossing Dirac cones of the two layers, giving rise to a critical twist angle that determines the energy separation between the saddle points in the band structure and the resonance Raman spectra accordingly. The 2D mode becomes sensitive to the twist angle, showing the angle‐dependent position, peak width, and intensity. Our results interpreted in the framework of angle‐dependent double resonance scattering provide an important experimental perspective in understanding the coupled bilayer graphene system. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
20.
Aji A. Anappara Alessandro Tredicucci Fabio Beltram Giorgio Biasiol Lucia Sorba 《Superlattices and Microstructures》2007,41(5-6):308
We report the external control of the intersubband polariton coupling by manipulating the carrier density in quantum wells resonantly coupled to a GaAs/AlGaAs microcavity. The electrons in the wells were tuned by means of a depletion gate bias or by utilizing charge transfer between the energetically aligned ground subbands of asymmetric tunnel-coupled quantum wells. We propose the use of tunnel-assisted control of the polariton ground state in an asymmetrically coupled quantum well for implementing ultrafast modulation of intersubband polaritons. 相似文献